New developments in the death of a Georgia toddler who died when he was left locked in a hot car for hours. Police are now investigating Cooper Harris’ mother, just days after the boy was buried in Alabama.

The boy’s father is already behind bars, facing murder and child cruelty charges. A day after she defended her husband against people who called him a murderer, CNN reports Leanna Harris may have to defend her own actions.

In search warrants released this weekend, police said quote, “Leanna Harris the child’s mother was also questioned regarding the incident and made similar statements regarding researching in car death’s and how it occurs.”

Police did not say when the search was done.

Left alone for seven hours in an SUV, 22-month-old Cooper Harris died. The high temperature that day was 92 degrees. The boy’s father, Justin Harris, has been charged with murder. he says he is not guilty. Harris phoned in to his baby’s funeral service and was heard over speaker phone sobbing. He thanked the crowd for their support and hundreds there stood to applaud him. Cameras were not allowed inside.

Questions that may also be aimed at the boy’s mother. Still to determine, if this was a tragic coincidence, or something much worse.

The medical examiner’s office found the child’s cause of death “consistent with “hyperthermia” but is waiting for toxicology test results before making an official ruling.